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Recent Projects

Featured Projects

Naval Air Station

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shim_trans  Summery
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shim_trans  Objective
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shim_trans  Project Background
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shim_trans  Scope of Work
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arrow_right  Bravo 25 Description
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shim_trans  Overview
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shim_trans  Crane Rail Removal
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shim_trans  Loss of Transverse
 Negative Moment
 Capacity over the
 Outboard Crane Rail
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shim_trans  Concrete Repair
 Materials
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shim_trans  Top Deck
 Repair Procedure
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shim_trans  Under Deck Repairs
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shim_trans  Cathodic Protection
 System
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shim_trans  Cathodic Protection
 System Installation
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shim_trans  Grout Resistivity
 Measurements
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shim_trans  Reinforcing Steel
 Lead Wire Installation
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shim_trans  Upgrade Reinforcement
 Introduction
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shim_trans  Analysis of Bravo-25
 Load Response
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shim_trans  Calculation of
 Bravo 25 Resistence
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shim_trans  Modes of Failure
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shim_trans  Bravo 25
 Upgrade Design
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shim_trans  Concrete Surface
 Preparation
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shim_trans  Embedded
 Reinforcement
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shim_trans  Wet Lay-up
 Composite Laminate
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shim_trans  Proof Tests using
 Impact Load Method
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shim_trans  Costs
 Acknowledgements
 References
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Turbine Deck Load Capacity Restored


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Home > Featured Project > Pearl Harbor

Featured Project

 

BRAVO 25 DESCRIPTION

Bravo 25 is located near the eastern end of Bravo wharves 22 through 26 in the Southeast Loch across from Merry Point of the NAVSTA. It is a cast-in-place, reinforced concrete deck and superstructure supported by precast concrete piles. The Bravo wharves are over 50 years old. Bravo 25 is 550 feet (168 m) long and 37 feet (11 m) wide. Bravo wharves were originally designed to support 50-ton (45 metric ton), rail mounted, portal cranes, train cars, as well as 900 pounds per square feet (43 kPa).

 

The design strength of the concrete was 3,000 psi (20 mPa) and the reinforcing steel is ASTM grade 40. Two continuous girders (pile girders) that were cast on top of two rows of piles (Figure 4) support an abandoned crane rail system and the deck. The piles are spaced 4 feet (1.2 m) on center. The piles are 18 inches (46 cm) square and have a design capacity of 40 tons (360 kN) each. Each bent has a transverse girder that spans between the two pile girders at 12 feet (3.7 m) on center. The transverse girders are 5 feet (1.5 m) deep and are reinforced with 14 - number 8 bars (25-mm diameter) at the bottom. Spanning between the transverse girders and parallel to the pile girders are two wide stringers (track slabs) (5 feet 6 inches (1.68 m) wide and 1 foot 8 inches (0.5 m) thick) which carry abandoned train rails (two rails per stringer). Reinforcement in the track slabs consists of 12 number 7 bars (22 mm diameter) at midspan and 8 number 7 bars (22 mm diameter) over the transverse girders. The deck is 8-1/2 inches (22 cm) thick between the track slabs and is reinforced on the bottom with number 5 bars (16 mm diameter) at 6 inches (15 cm) on center and number 3 bars (10 mm diameter) at 5 inches (8 cm) on center outside the track slabs. Number 4 bars (13 mm diameter) reinforce the deck longitudinally. That part of the deck with the curb that cantilevers out from the outboard pile girder (curb slab) is 13-1/2 inches (34 cm) thick and is reinforced with number 6 bars (19 mm diameter) at 5 inches (13 cm) on center. The top reinforcing bars are bent down and anchored below the outboard crane rail. The top transverse reinforcing is not continuous because of the crane and train rails. Figures 5 and 6 are graphics of existing reinforcing steel.

 

Track mounted cranes have been replaced on the Bravo wharves by truck mounted, mobile cranes. Mobile crane load limitations currently placed on Bravo wharves are very restrictive. A Public Works Center (PWC) waterfront load study of January 1994 by Tanimura and Associates (Contract No. N62755-90-D-0920) limits crane outrigger loads to the track slabs and the rail girders. Other areas are restricted to truck and forklift wheel loads. Maximum uniform live load is limited to 490 psf (23 kPa).

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Figure 4. Typical cross section of Bravo 25.


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Figure 5. Typical deck reinforcing details at midspan between transverse girders.

 

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Figure 6. Typical reinforcing details of the transverse girder.


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ACE Restoration & Waterproofing, Inc.
620 E. Walnut Ave.
Fullerton, CA 92831
714.526.7366
Fax: 714.526.7965

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